This is the shocking moment K-pop star Hyuna collapsed in the middle of a concert in Macau.

The singer, 33, was performing her hit song 'Bubble Pop' when she fainted onstage at the Waterbomb Macau festival on November 9.

Footage shows the South Korean celebrity doing body waves before dropping unconscious as shocked spectators screamed.

Her two backup dancers rushed to her aid before a security staff member carried her off the platform.

Hyuna later apologised on Instagram, assuring her fans that she was fine.

She wrote in Korean: 'I'm truly, truly sorry. Although it was only a short time since my last performance, I wanted to show you a great performance, but I don't feel like I managed to be professional.

'I'll try to build my stamina and consistently work hard in the future. It would be amazing if everything went the way I wanted it to.

'And I'm really okay! Don't worry about me!'

The singer did not clarify what caused the collapse, but she sparked concern earlier in October after revealing she allegedly lost 10 kilograms (22 pounds) in just one month.